© Michael Mee, FEMAHail can accumulate to remarkable depths when a storm becomes stationary over one place for a period of time. The hail in this photograph, however, drifted this deep after floodwaters washed it into these giant heaps in a low-lying area.
Recently, an investigation into a hailstorm that took place in Villa Carlos Paz, Cordoba Province, Argentina on February 8, 2018, reported that a hailstone some 9.3 inches in diameter may have fallen during a storm there. The Weather Channel's Chris Dolce has a
summary of the event, which has been documented in a February paper for the
Bulletin of the American Meteorological Society entitled "
Gargantuan Hail in Argentina." The authors propose that hailstones larger than 6" in diameter be classified as "gargantuan".
If verified, the Argentine hailstone would surpass the U.S. record holder, an 8-inch-diameter stone collected near Vivian, South Dakota on July 23, 2010. (
That hailstone was said to have actually been 11" in diameter before a portion of it melted prior to being officially measured.) However, the Argentine hailstone will likely never become an official record, since its size was estimated only from video evidence and not from any first-hand measurements.
On Friday night, May 22, 2020, a hailstone of 5.33" diameter was reported in Burkburnett, Texas (the same hailstone shown in
this Facebook post). With peak U.S. hail season at hand, here is a recap (portions of which appeared in a
blog entry I posted in April 2018) of the costliest and deadliest hailstorms in U.S. history, along with a summary of the largest hailstones yet observed in the United States.
Comment: Meanwhile: Siberia in midst of freak heat wave